/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.social.security;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.social.UserIdSource;

/**
 * Implementation of UserIdSource that returns the Spring Security {@link Authentication}'s name as the user ID.
 * @author Craig Walls
 */
public class AuthenticationNameUserIdSource implements UserIdSource {

	public String getUserId() {
		Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
		if (authentication == null) {
			throw new IllegalStateException("Unable to get a ConnectionRepository: no user signed in");
		}
		return authentication.getName();
	}
	
}
